std:: make_error_code (std::io_errc)

Constructs an std::error_code object from a value of type std::io_errc as if by return std:: error_code ( static_cast < int > ( e ) , std:: iostream_category ( ) ) .

This function is called by the constructor of std::error_code with an std::io_errc argument.

Parameters

Return value

A value of type std::error_code that holds the error code number from e associated with the error category "iostream" .

Example

#include <iostream>
#include <system_error>
 
int main()
{
    std::error_code ec = std::make_error_code(std::io_errc::stream);
 
    // This works because of the overloaded method
    //    and the is_error_code_enum specialization.
    ec = std::io_errc::stream;
 
    std::cout << "Error code from io_errc::stream has category "
              << ec.category().name() << '\n';
}

Error code from io_errc::stream has category iostream

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

See also